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Offsetting of Assets and Liabilities (Details) (USD $)
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Dec. 31, 2014
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Dec. 31, 2013
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| Offsetting of Assets and Liabilities [Line Items] |
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| Financial derivatives–assets, at fair value- |
$ 80,029,000us-gaap_DerivativeAssets |
[1] |
$ 59,664,000us-gaap_DerivativeAssets |
[1] |
| Fair value repurchase agreements |
172,001,000us-gaap_SecuritiesForReverseRepurchaseAgreements |
[1] |
27,962,000us-gaap_SecuritiesForReverseRepurchaseAgreements |
[1] |
| Financial derivatives–liabilities, at fair value- |
(66,116,000)us-gaap_DerivativeLiabilities |
[1] |
(44,791,000)us-gaap_DerivativeLiabilities |
[1] |
| Reverse Repurchase Agreements |
(1,669,433,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchase |
[1] |
(1,236,166,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchase |
[1] |
| Derivative Liability Instruments available for offset |
(40,671,000)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral |
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(24,162,000)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral |
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| Reverse Repurchase Agreements Available for Offset |
(172,001,000)efc_Securitiessoldunderagreementstorepurchaseavailableforoffset |
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(27,962,000)efc_Securitiessoldunderagreementstorepurchaseavailableforoffset |
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| Derivative Asset Instruments available for offset |
26,758,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral |
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24,162,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral |
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| Repurchase Agreements Available for Offset |
172,001,000efc_Securitiespurchasedunderagreementstoresellavailableforoffset |
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27,962,000efc_Securitiespurchasedunderagreementstoresellavailableforoffset |
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| Repurchase Agreements and Related Collateral Net |
0efc_RepurchaseAgreementsandRelatedCollateralNet |
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0efc_RepurchaseAgreementsandRelatedCollateralNet |
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| Reverse Repurchase Agreements and Related Collateral Net |
0efc_ReverseRepurchaseAgreementsandRelatedCollateralNet |
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0efc_ReverseRepurchaseAgreementsandRelatedCollateralNet |
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| Securities Collateral realting to Repurchase and Reverse Repurchase Agreements |
1,940,000,000efc_SecuritiesCollateralRealtingToRepurchaseAndReverseRepurchaseAgreements |
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1,480,000,000efc_SecuritiesCollateralRealtingToRepurchaseAndReverseRepurchaseAgreements |
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| Financial Derivatives - Assets [Member] |
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| Offsetting of Assets and Liabilities [Line Items] |
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| Financial derivatives–assets, at fair value- |
80,029,000us-gaap_DerivativeAssets / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |
[2],[3] |
59,664,000us-gaap_DerivativeAssets / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |
[2],[4] |
| Financial Instruments Pledged as Collateral |
0us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |
[5],[6] |
0us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |
[5],[6] |
| Cash Collateral (Received) Pledged |
(5,578,000)us-gaap_RestrictedCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |
[5],[6] |
(17,273,000)us-gaap_RestrictedCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |
[5],[6] |
| Derivatives and Related Collateral Net |
33,780,000efc_DerivativesandRelatedCollateralNet / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |
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18,229,000efc_DerivativesandRelatedCollateralNet / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |
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| Excess cash collateral |
22,700,000efc_Excesscashcollateral / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |
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3,200,000efc_Excesscashcollateral / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |
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| Securities Purchased under Agreements to Resell [Member] |
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| Offsetting of Assets and Liabilities [Line Items] |
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| Financial Instruments Pledged as Collateral |
0us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue / us-gaap_InvestmentTypeAxis = efc_SecuritiesPurchasedunderAgreementstoResellMember |
[5],[6] |
0us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue / us-gaap_InvestmentTypeAxis = efc_SecuritiesPurchasedunderAgreementstoResellMember |
[5],[6] |
| Cash Collateral (Received) Pledged |
0us-gaap_RestrictedCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = efc_SecuritiesPurchasedunderAgreementstoResellMember |
[5],[6] |
0us-gaap_RestrictedCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = efc_SecuritiesPurchasedunderAgreementstoResellMember |
[5],[6] |
| Reverse Repurchase Agreements [Member] |
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| Offsetting of Assets and Liabilities [Line Items] |
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| Financial Instruments Pledged as Collateral |
1,483,187,000us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue / us-gaap_InvestmentTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |
[5],[6] |
1,205,278,000us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue / us-gaap_InvestmentTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |
[5],[6] |
| Cash Collateral (Received) Pledged |
14,245,000us-gaap_RestrictedCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |
[5],[6] |
2,926,000us-gaap_RestrictedCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |
[5],[6] |
| Financial Derivatives - Liabilities [Member] |
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| Offsetting of Assets and Liabilities [Line Items] |
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| Financial derivatives–liabilities, at fair value- |
(66,116,000)us-gaap_DerivativeLiabilities / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember |
[2],[3],[7] |
(44,791,000)us-gaap_DerivativeLiabilities / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember |
[2],[4] |
| Financial Instruments Pledged as Collateral |
0us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember |
[5],[6] |
0us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember |
[5],[6] |
| Cash Collateral (Received) Pledged |
17,393,000us-gaap_RestrictedCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember |
[5],[6] |
20,629,000us-gaap_RestrictedCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember |
[5],[6] |
| Derivatives and Related Collateral Net |
(21,965,000)efc_DerivativesandRelatedCollateralNet / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember |
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0efc_DerivativesandRelatedCollateralNet / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember |
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| Excess cash collateral |
$ 23,200,000efc_Excesscashcollateral / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember |
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$ 36,400,000efc_Excesscashcollateral / us-gaap_InvestmentTypeAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember |
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